I would buy a GRAM, but as far as it's known that while it is not sold to the masses. Official sales come only in the 3rd quarter 2019 year with the launch of platform. And one more thing. To the ICO investors of the TON's project, who will be the first to receive gram,will prohibited to sell received tokens within 18 months.
One project im looking forward to investing in at IEO is Tokoin.io
They are a major support project offering a platform for small businesses to network, receive finance and flourish among others in the platform ecosystem. They recently sold out two tokensales within minutes, so demands there plus they are tapping into a massive market.